svoid test_roundUpToPowerOfTen() {
  for (double exp = 0.5; exp <= log10(Int.MAX_INT-100); exp += 0.1) {
    int n = iround(exp10(exp));
    long answer = iround(roundUpToPowerOfTen_double(n));
    long toCheck = roundUpToPowerOfTen(n);
    assertEqualsVerbose(str(n), answer, check);
  }
}